Implantable medical device with MRI and gradient field induced capture detection methods
First Claim
1. An implantable medical device (IMD), comprising:
- a telemetry circuit antenna;
a lead having an elongated body for carrying a conductor extending from a proximal connector to a distal electrode;
a circuit for measuring a voltage induced on the telemetry circuit antenna and generating an antenna voltage signal corresponding to the measured voltage on the antenna;
a circuit for measuring a voltage induced on the lead conductor and generating a lead voltage signal corresponding to the measured voltage on the lead; and
processing circuitry for receiving the antenna voltage signal and the lead voltage signal and for generating an MRI detection signal if the antenna voltage signal exceeds a first predetermined MRI detection threshold and the lead voltage signal exceeds a second predetermined MRI detection threshold; and
control circuitry for providing a response to the MRI detection signal.
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Accused Products
Abstract
An implantable medical device is provided having a telemetry circuit antenna; a lead having an elongated body for carrying a conductor extending from a proximal connector to a distal electrode; a circuit for measuring voltage induced on the telemetry circuit antenna and generating an antenna voltage signal corresponding to the measured voltage on the antenna; a circuit for measuring voltage induced on the lead conductor and generating a lead voltage signal corresponding to the measured voltage on the lead; and processing circuitry for receiving the antenna voltage signal and the lead voltage signal and for generating an MRI detection signal if the antenna voltage signal and the lead voltage signal meet an MRI detection requirement. The device further includes control circuitry for providing a safeguard response to the MRI detection signal.
107 Citations
20 Claims
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1. An implantable medical device (IMD), comprising:
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a telemetry circuit antenna;
a lead having an elongated body for carrying a conductor extending from a proximal connector to a distal electrode;
a circuit for measuring a voltage induced on the telemetry circuit antenna and generating an antenna voltage signal corresponding to the measured voltage on the antenna;
a circuit for measuring a voltage induced on the lead conductor and generating a lead voltage signal corresponding to the measured voltage on the lead; and
processing circuitry for receiving the antenna voltage signal and the lead voltage signal and for generating an MRI detection signal if the antenna voltage signal exceeds a first predetermined MRI detection threshold and the lead voltage signal exceeds a second predetermined MRI detection threshold; and
control circuitry for providing a response to the MRI detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable medical device (IMD) comprising:
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means for providing electrical stimulation;
means for delivering the electrical stimulation to a site;
means for providing telemetric communication including an antenna;
means for measuring a first voltage on the means for delivering and a second voltage on the antenna and proving an output signal; and
means for initiating an MRI response based upon the output signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method comprising:
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sensing a first voltage on a lead coupled with an implantable medical device (IMD);
sensing a second voltage on an antenna coupled with the IMD;
comparing the first voltage to a first threshold;
comparing the second voltage to a second threshold; and
initiating an MRI response if the first voltage exceeds the first threshold or the second voltage exceeds the second threshold. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification